Supergirl #5 Variant Edition

'REIGN OF THE CYBORG SUPERMEN' part five! As National City becomes a war zone, Cyborg Superman's plan to resurrect Argo City reaches its deadly final phase: rain Argo City itself down upon the earth! Supergirl is all that stands in the way of total destruction-but with the clock ticking and the stakes rising she'll need more than just brute force. She'll need the help of Cat Grant? RATED T